温度对水稻每穗颖花数的影响

Effects of temperatures on spikelets per panicle of rice

用分期播种法,研究了水稻浙38A/9308、协优413、协优95 16、协优9308、绍糯119、丙94 54、IRAT127、IRAT17494 32 1等每穗颖花数与幼穗分化期气象条件的关系。结果表明:温度是影响每穗颖花数的主要气象因子。在本试验条件下,存在2个形成大穗的适宜温度范围,在此范围内每穗颖花数随温度变化呈"倒抛物线"关系。粳稻形成大穗的适宜温度为25.0±0.2℃,30.1±0.4℃;籼稻为19.4～23.5℃,30.1±0.6℃;不利于粳稻品种形成大穗的温度为27.9±0.2℃;籼稻为24.6～27.7℃。

This paper studied effects of weather conditions on spikelets per panicle by the method of interval sowing times in the field.The results showed that temperature was a major factor affecting formation spikelets per panicle.Under the condition,two temperatures (25.0±0.2℃,30.1±0.4℃ for japonica rice and 19.4-23.5℃,30.1±0.6℃ for indica rice) was beneficial to the formation of spikelets per panicle. The temperature of 27.9±0.2℃ was not beneficial to the formation of spikelets per panicle of japonica rice,whereas the temperature of 24.6-27.7℃ was not beneficial to the formation of spikelets per panicle of indica rice.